This is intended to a quick and easy project for a beginner to embedded
systems using an Arduino.

 The parts required are a perf board (or a solderless bread board), an LM35
or a TMP36 temperature sensor, a 74HC238, 8 LEDs, a .1 uF cap and of course 
an Arduino. See the supplied schematic. If I had it to do over again I 
wouldn't have spent the socket for the chip. See the photos.

 The circuit board (or the chip in a breadboard) connects to three Arduino data
pins.  These select one of 8 LEDs.  The supplied code will flash these LEDs in
sequnce while waiting to read the thermometer. The output appears on 
the serial monitor of the Arduino IDE.  It also goes to /dev/ttyACMx 
where x can change. 

I often use 
	tail -f </dev/ttyACM0  >>tlog
 to capture the output, and then
	tail -f tlog to 
read it.  I can also use 
	while true; do date >>tlog; sleep 60; done
To put a timestamp in the log.